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What is a relationship called when it is maintained between two entities?

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What is a relationship called when it is maintained between two entities?

(a) Unary

(b) Binary

(c) Ternary

(d) Quaternary

The question was posed to me in an interview for internship.

I'm obligated to ask this question of Entity-Relationship Design Issues topic in division Database Systems Design and Implementation of Database Management

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Right option is (b) Binary

To explain: Binary word usually represents two attributes.

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